Re: 2.5.69+bk: oops in apmd after waking up from suspend mode

From: Carl-Daniel Hailfinger (c-d.hailfinger.kernel.2003@gmx.net)
Date: Tue May 20 2003 - 05:39:54 EST

Alex Riesen wrote:
> Alex Riesen, Mon, May 19, 2003 14:31:19 +0200:
>
>>>>EIP is at fix_processor_context+0x5f/0x100
>>>>Process kapmd (pid: 4, threadinfo=c5f0e000 task=c5fbc640)
>>>
>>>After receiving Alex' .config and gcc version (3.2.3), I've been
>>>able to decipher this. current->mm is NULL in the kapmd task. The call
>>>
>>> load_LDT(&current->mm->context); /* This does lldt */
>>>
>>>in fix_processor_context() computes the address of context as
>>>(current->mm)+0x7c, which is 0x7c. load_LDT_nolock() dereferences
>>>0x7c+0x14 (void *segments = pc->ldt) and the oops follows.
>>>
>>>As to _why_ kapmd's current->mm is NULL, I don't know. It isn't
>>>when I test APM suspend in 2.5.69-bk. A lot of code dereferences
>>>current->mm without checking, so I guess current->mm==NULL is a bug.
>>
>>i just go and try it with the latest -bk.
>
> no change. Still oopses.

Could you try to compile with gcc-3.3? In another thread (2.5.69-mm6:
pccard oops) this helped IIRC. I'm suspecting gcc 3.2.3 generates
incorrect code for some cases.

Regards,
Carl-Daniel 

-- 
http://www.hailfinger.org/

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